The EVAP system purges any build up of vapours from the fuel tank and burns them thro the engine at pre-detemined times. This is done by means of the EVAp solenoid which when energised allows engine vacuum at one side to **** the vapours from the other side and pass them thro engine. Look for the black solenoid with two vacuum pipes and two wire plug on it. think you may be correct and have disturbed it when doing the air filter.
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It is a 2002 Jaguar Vanden Plas 4.0 liter V8, without supercharger.
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